Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bf46a0e8a0de1c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 19:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad4cac8b39c2c1ca165a75fdb0512140 SHA-1: 23cb99af1a219374311c2b060c807404df8d68da SHA-256: 96bf46a0e8a0de1cdbc98f437ac5d353e7935048b825551c33757cc7ed8a39cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a distribution point for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://newline-eg.com/userfiles/file/goxikenodonajone.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/83222130985.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/58780786791.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kibekatidodopasewuwari.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tekepawesa.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/limeralotesubebevusiv.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/rezaxudep.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/64010643021.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136640b394a6---40264648688.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/33162165871.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/tarilimofugon.pdfIn PDF document text
    • https://davnosti.ru/upload/xadivosutavelaxezod.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/7aa21c4fa8e3e5e0fbdb79caa76b3e22.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/gadubixebivovesibasixezuw.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/zifavajijikelelubifuz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f8f9f1b4509c0a49515df14738ef285b/tokifivizomutozep.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/92124756167.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/10387608236.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/27/file/20210927_091034_148.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210928142421754092jbd9y.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/funupeji.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/93498602185.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vibewo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/13770469480.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/wokimapugozakapon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+root+onn+tablet+without+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 10620 bytes
SHA-256: a967cc1a8f5269a5dde0ba08f017c957d56db8dbb2eb5017c0f2a89a2092ec6a
font_02_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 16080 bytes
SHA-256: 91ebe715f6b84434b52eb534e03c4647deb4d6a03d330acf8cd234e77579dee3